Amount of megawatts

No definition available.

Name:	aee_AmountofMegawatts
Namespace Prefix:	aee_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	duration

- Definition

Energy efficiency investments in MEEIA 2024 programs

+ References

No definition available.

+ Details

Name:	aee_EnergyEfficiencyInvestmentsInMEEIA2024Programs
Namespace Prefix:	aee_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

MEEIA performance incentive awards earned if energy efficiency goals are achieved.

+ References

No definition available.

+ Details

Name:	aee_IncentiveAwardIfEnergyEfficiencyGoalsAreAchieved
Namespace Prefix:	aee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

MEEIA performance incentive awards earned if energy efficiency goals are exceeded.

+ References

No definition available.

+ Details

Name:	aee_IncentiveAwardsIfEnergyEfficiencyGoalsAreExceeded
Namespace Prefix:	aee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage of retail sales from renewable sources required by the Missouri renewable energy standard.

+ References

No definition available.

+ Details

Name:	aee_MissouriRenewableEnergyStandardPercentage
Namespace Prefix:	aee_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of retail sales from solar sources required by the Missouri renewable energy standard.

+ References

No definition available.

+ Details

Name:	aee_MissouriRenewableEnergyStandardPercentageSolar
Namespace Prefix:	aee_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of countries being investigated by the Department of Commerce related to solar panel imports.

+ References

No definition available.

+ Details

Name:	aee_NumberOfCountriesInvestigatedByTheDOC
Namespace Prefix:	aee_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage MEEIA of Energy Efficiency Goals Achieved.

+ References

No definition available.

+ Details

Name:	aee_PercentageOfEnergyEfficiencyGoalsAchieved
Namespace Prefix:	aee_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum percentage of energy allowed to be sourced from renewable resources under the Renewable Solutions Program.

+ References

No definition available.

+ Details

Name:	aee_PercentageOfEnergySourcedFromRenewableResources
Namespace Prefix:	aee_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate And Regulatory Matters [Line Items]

+ References

No definition available.

+ Details

Name:	aee_RateAndRegulatoryMattersLineItems
Namespace Prefix:	aee_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=aee_UnionElectricCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=aee_WindGenerationFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilityAxis=us-gaap_ElectricityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=aee_PendingRateCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAssetAxis=aee_MEEIA2024Domain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Rate And Regulatory Matters (Narrative-Missouri) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) numberOfCountriesInvestigatedByTheDOC	Sep. 30, 2022 USD ($)	Jun. 30, 2022 MWh	Mar. 31, 2022 USD ($) MWh
Rate And Regulatory Matters [Line Items]
Capital expenditures	$ 931			$ 774
Union Electric Company
Rate And Regulatory Matters [Line Items]
Capital expenditures	$ 481			$ 414
Missouri Renewable Energy Standard Percentage	15.00%
Missouri Renewable Energy Standard Percentage - Solar	2.00%
Number of Countries Investigated by the DOC \| numberOfCountriesInvestigatedByTheDOC	4
Union Electric Company \| Wind Generation Facility
Rate And Regulatory Matters [Line Items]
Amount of Megawatts \| MWh			200	150
Capital expenditures	$ 350
Union Electric Company \| Electric \| Pending Rate Case
Rate And Regulatory Matters [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	140	$ 316
Union Electric Company \| Electric \| MEEIA 2024 [Domain]
Rate And Regulatory Matters [Line Items]
Energy efficiency investments in MEEIA 2024 programs	$ 122
Percentage of Energy Efficiency Goals Achieved	100.00%
Incentive Award if Energy Efficiency Goals Are Achieved	$ 55
Incentive Awards if Energy Efficiency Goals Are Exceeded	$ 14
Union Electric Company \| Maximum
Rate And Regulatory Matters [Line Items]
Percentage of energy sourced from renewable resources	100.00%